In the history of the Academy, these Best Picture winners were nominated for, but did not win, in the writing category (original or adapted):
All Quiet on the Western Front
Mutiny on the Bounty
Great Ziegfeld
You Can’t Take It With You
Rebecca
How Green Was My Valley
Gentleman’s Agreement
All the King’s Men
Ben-Hur
West Side Story
Lawrence of Arabia
My Fair Lady
Oliver!
Rocky
Deer Hunter, The
Platoon
Unforgiven
Braveheart
English Patient, The
Gladiator
Chicago
Million Dollar Baby
Artist, The
Conclusion:
Those failing to win in the writing category amount to one fourth (23 films) of the Best Picture winners.